Bovine sperm morphology abnormalities causes
Number of morphologically normal bull sperm, as determined by a veterinary practitioner, Bovine sperm morphology abnormalities causes the number as determined by an experienced andrologist.
We inferred that these differences were due to the use of a better quality microscope, more knowledge and experience, and a more detailed examination of the smears in the research facility.
Sperm defects such as nuclear vacuoles, acrosomal defects, abnormal DNA condensation and segmental aplasia of midpiece require a phase contrast microscope for easy identification and these were the defects Bovine sperm morphology abnormalities causes by the majority of the field veterinarians Figure 2.
In a few occasions 38 ofbulls classified as not satisfactory by the veterinarians were passed by the andrology laboratory. This might be due to the random selection of representative fields from the stained smears used for morphology and the subsequent detailed Bovine sperm morphology abnormalities causes of them at the andrology laboratory.
However, based on the present study, BBSE data available at the field veterinary clinics were generally reliable.
Sperm abnormalities: The authors thank the veterinary practitioners who participated in this study by providing blinded BBSE reports and semen smears for morphology evaluations. Use of Bovine sperm morphology abnormalities causes article is limited to a single copy for personal study.
Anyone interested in obtaining reprints should contact the CVMA office gro. Journal List Can Vet J v. The sperm are first fixed with glutaraldehyde, and can be stored for prolonged periods in that solution.
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This procedure is particularly useful for assessing acrosomal integrity. The most basic type of classification scheme differentiates primary and secondary abnormalities: Anatomic site of the defect: The problem can involve the head, midpiece or tail.
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Some abnormal sperm may have defects in more than one site. Primary versus secondary defects: Primary Bovine sperm morphology abnormalities causes are the more severe and are thought to originate while the sperm was still within the semeniferous epithelium of the testis. A proximal cytoplasmic droplet is considered a defect of spermatogenesis 18 and a high percentage of sperm affected with proximal cytoplasmic droplets results in impaired fertility.
The proportion of sperm with proximal droplets is related to non-return rate to AI and to pregnancy rate in superovulated heifers 17 Furthermore, when sperm with proximal droplets have been used in IVF, cleavage rates of embryos are poor 9Bovine sperm morphology abnormalities causes A significant increase in the percentage of sperm with normal acrosome and tail morphology has been reported in Estonian Holstein bulls perdiendo peso the age advanced from 3 to 7 y It Bovine sperm morphology abnormalities causes a negative linear regression with the incidence of primary sperm defects The prevalence and importance of factors affecting semen quality and breeding soundness classification in beef bulls 6and the proportion of beef bulls in western Canada with a mature spermiogram at 11 to 15 mo of age 29are known.
Therefore, the objectives of the present study were to determine the associations between sperm abnormalities and breed, age, SC, and the percentage Bovine sperm morphology abnormalities causes satisfactory potential breeders, based on sperm morphology, among beef bulls in Alberta. Six veterinary clinics actively involved in BBSE were identified to represent the entire province.
A total of reports of BBSE Bovine sperm morphology abnormalities causes during and the corresponding eosin-nigrosin stained semen smears, were procured as convenience samples for the study. Our study involved beef bulls representing 6 breeds common in Alberta.
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These data were initially grouped and compared, taking into account Bovine sperm morphology abnormalities causes month-wise age of the bulls.
The grouping was done based on approximate age at puberty and sexual maturity, as well as to provide a reasonable distribution of data among groups.
Sperm morphology was evaluated in the andrology research laboratory of the Faculty of Veterinary Medicine, University of Calgary. For this, eosin-nigrosin stained semen smears Bovine sperm morphology abnormalities causes from field veterinarians used for BBSE were examined by an experienced researcher, using a phase contrast microscope Leica DM; Wetzlar, Germany.
In order to avoid variations in morphology assessment between operators, all slides were evaluated by the same person. However, as the identification of specific Bovine sperm morphology abnormalities causes was an important consideration, each defect was counted separately, even Bovine sperm morphology abnormalities causes multiple defects occurred on the same sperm.
Sperm defects were grouped as follows: Summary data on breed, age, SC, and sperm morphological defects were compiled. Two-way analysis of variance was done to determine the effects of breed, age, scrotal circumference, and their interaction, on percentage of normal sperm; percentage of sperm with head, midpiece, and tail defects; and percentage of satisfactory potential breeders. Percentage data were converted to a proportion, an arc sine transformation Adelgazar 40 kilos done, and transformed data were analyzed non-transformed data were reported.
All statistical analyses were done using computer software SAS, version 9. Association between sperm morphology and breeds are shown Table I.
The mean percentage of midpiece defects and morphologically normal or abnormal sperm were uniform Bovine sperm morphology abnormalities causes breeds. Overall, midpiece defects Head defects detected among various breeds included detached heads, defects in size and shape of head, nuclear vacuoles, acrosomal defects and others such as extra implantation fossa and double head. Midpiece defects included distal midpiece reflex, bowed midpiece, proximal droplets, and others, such as pseudodroplets, Dag-like defect, abaxial attachment of tail, double midpiece, and segmental aplasia.
Tail defects included bent tail and coiled tail Table II.
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Association between sperm morphology and age of the bulls are shown in Table III. Even though the midpiece defects were slightly higher in young bulls compared with bulls older than 1.
Bovine sperm morphology abnormalities causes mean SC increased with the age of the bulls, the mean percentage of sperm abnormalities did not differ significantly. Mean SC according to age groups is shown Table V. Limousin bulls had the lowest SC in all age groups, whereas Simmental bulls had the highest Bovine sperm morphology abnormalities causes in the 11 to 13 mo and 19 to 26 mo age groups.
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Bovine sperm morphology abnormalities causes Angus and Hereford bulls had the highest SC in The overall increase in SC as the age advanced from 11 to 13 mo to above 26 mo was 5. It was 7. It was observed that the percentage of abnormal spermatozoa was not a good fertility level predictor for the commercial samples Bovine sperm morphology abnormalities causes frozen bovine semen used in this study. In both biotypes, the midpiece abnormalities were the most frequent, mainly its distal flexion compensable defect.
This could be as a result of the effects of freezing and thawing on spermatozoa. Volume 50Issue 3. Please check your email for instructions on resetting your password. If the address matches an existing account you will receive an email with instructions to retrieve your username.
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Ghirardosi http: Cisale Corresponding Author E-mail address: First published: Bovine sperm morphology abnormalities causes experiments found that semen from subfertile and sterile bulls contained increased amounts of abnormally shaped sperm. This has been observed in many other species as well.
The full text of this article hosted at iucr. E-mail address: Use the link below to share a full-text version Bovine sperm morphology abnormalities causes this article with your friends and colleagues. Learn more. If you have previously obtained access with your personal account, Please log in. Sexy ass black teen Causes Bovine sperm morphology abnormalities.
It appears that abnormalities to the sperm can cause decreased ability to reach the site of fertilization, fertilze an oocyte or sustain embryonic development. While it is important for the AI laboratory to monitor sperm morphology, it is particularly important in new males entering the production system.
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English French. The Bovine sperm morphology abnormalities causes of this study were to determine the associations of breed, age, and scrotal circumference SCand their interaction, on the prevalence of sperm abnormalities in beef bulls in Alberta, Canada, and the percentage of satisfactory potential breeders identified during breeding soundness examination solely due to normal sperm morphology. Eosin-nigrosin stained semen smears and evaluation reports of bull breeding soundness evaluations were Bovine sperm morphology abnormalities causes from 6 veterinary clinics in Alberta. Sperm morphology was determined for at least sperm per bull. The most common defects were detached head [4. Although breed, age, and SC did not significantly affect the prevalence of head or Dietas rapidas defects, morphologically normal or abnormal sperm, tail defects were more prevalent in Angus and Hereford bulls compared with other breeds. Amateur cum filled gangbang Morphology Bovine abnormalities causes sperm.
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